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最新评论
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zcz123:
路过,帮踩踩!
SyntaxHighlighter使用方法[转] -
comesmiletoface:
原来一直在使用HWPF哎
Apache POI介绍 -
rjkfABC:
什么神仙,我看就是男人写出来的!
一个女程序员的征婚信息: -
zcz123:
在csdn上看过,不过这样女人估计是神仙
一个女程序员的征婚信息:
iBatis一些非见用法,基本上解决所有棘手问题,下面总结如下:
1、动态SQL片段
通过SQL片段达到代码复用
<!-- 动态条件分页查询 -->
<sql id="sql_count">
select count(*)
</sql>
<sql id="sql_select">
select *
</sql>
<sql id="sql_where">
from icp
<dynamic prepend="where">
<isNotEmpty prepend="and" property="name">
name like '%$name$%'
</isNotEmpty>
<isNotEmpty prepend="and" property="path">
path like '%path$%'
</isNotEmpty>
<isNotEmpty prepend="and" property="area_id">
area_id = #area_id#
</isNotEmpty>
<isNotEmpty prepend="and" property="hided">
hided = #hided#
</isNotEmpty>
</dynamic>
<dynamic prepend="">
<isNotNull property="_start">
<isNotNull property="_size">
limit #_start#, #_size#
</isNotNull>
</isNotNull>
</dynamic>
</sql>
<select id="findByParamsForCount" parameterClass="map" resultClass="int">
<include refid="sql_count"/>
<include refid="sql_where"/>
</select>
<select id="findByParams" parameterClass="map" resultMap="icp.result_base">
<include refid="sql_select"/>
<include refid="sql_where"/>
</select>
2、数字范围查询
所传参数名称是捏造所得,非数据库字段,比如_img_size_ge、_img_size_lt字段
<isNotEmpty prepend="and" property="_img_size_ge">
<![CDATA[
img_size >= #_img_size_ge#
]]>
</isNotEmpty>
<isNotEmpty prepend="and" property="_img_size_lt">
<![CDATA[
img_size < #_img_size_lt#
]]>
</isNotEmpty>
多次使用一个参数也是允许的
<isNotEmpty prepend="and" property="_now">
<![CDATA[
execplantime >= #_now#
]]>
</isNotEmpty>
<isNotEmpty prepend="and" property="_now">
<![CDATA[
closeplantime <= #_now#
]]>
</isNotEmpty>
3、时间范围查询
<isNotEmpty prepend="" property="_starttime">
<isNotEmpty prepend="and" property="_endtime">
<![CDATA[
createtime >= #_starttime#
and createtime < #_endtime#
]]>
</isNotEmpty>
</isNotEmpty>
4、in查询
<isNotEmpty prepend="and" property="_in_state">
state in ('$_in_state$')
</isNotEmpty>
5、like查询
<isNotEmpty prepend="and" property="chnameone">
(chnameone like '%$chnameone$%' or spellinitial like '%$chnameone$%')
</isNotEmpty>
<isNotEmpty prepend="and" property="chnametwo">
chnametwo like '%$chnametwo$%'
</isNotEmpty>
6、or条件
<isEqual prepend="and" property="_exeable" compareValue="N">
<![CDATA[
(t.finished='11' or t.failure=3)
]]>
</isEqual>
<isEqual prepend="and" property="_exeable" compareValue="Y">
<![CDATA[
t.finished in ('10','19') and t.failure<3
]]>
</isEqual>
7、where子查询
<isNotEmpty prepend="" property="exprogramcode">
<isNotEmpty prepend="" property="isRational">
<isEqual prepend="and" property="isRational" compareValue="N">
code not in
(select t.contentcode
from cms_ccm_programcontent t
where t.contenttype='MZNRLX_MA'
and t.programcode = #exprogramcode#)
</isEqual>
</isNotEmpty>
</isNotEmpty>
<select id="findByProgramcode" parameterClass="string" resultMap="cms_ccm_material.result">
select *
from cms_ccm_material
where code in
(select t.contentcode
from cms_ccm_programcontent t
where t.contenttype = 'MZNRLX_MA'
and programcode = #value#)
order by updatetime desc
</select>
9、函数的使用
<!-- 添加 -->
<insert id="insert" parameterClass="RuleMaster">
insert into rulemaster(
name,
createtime,
updatetime,
remark
) values (
#name#,
now(),
now(),
#remark#
)
<selectKey keyProperty="id" resultClass="long">
select LAST_INSERT_ID()
</selectKey>
</insert>
<!-- 更新 -->
<update id="update" parameterClass="RuleMaster">
update rulemaster set
name = #name#,
updatetime = now(),
remark = #remark#
where id = #id#
</update>
10、map结果集
<!-- 动态条件分页查询 -->
<sql id="sql_count">
select count(a.*)
</sql>
<sql id="sql_select">
select a.id vid,
a.img imgurl,
a.img_s imgfile,
b.vfilename vfilename,
b.name name,
c.id sid,
c.url url,
c.filename filename,
c.status status
</sql>
<sql id="sql_where">
From secfiles c, juji b, videoinfo a
where
a.id = b. videoid
and b.id = c.segmentid
and c.status = 0
order by a.id asc,b.id asc,c.sortnum asc
<dynamic prepend="">
<isNotNull property="_start">
<isNotNull property="_size">
limit #_start#, #_size#
</isNotNull>
</isNotNull>
</dynamic>
</sql>
<!-- 返回没有下载的记录总数 -->
<select id="getUndownFilesForCount" parameterClass="map" resultClass="int">
<include refid="sql_count"/>
<include refid="sql_where"/>
</select>
<!-- 返回没有下载的记录 -->
<select id="getUndownFiles" parameterClass="map" resultClass="java.util.HashMap">
<include refid="sql_select"/>
<include refid="sql_where"/>
</select>
注意:在使用Map作为结果集返回类型时候,必须这么设置结果集类型resultClass="java.util.HashMap",这时候,需要根据字段的名称来取值,值类型为Object,key类型为String,这点要注意了:
定义的DAO方法实现如下:
public List<Map<String,Object>> findUndownFiles(Map map) {
return getSqlMapClientTemplate().queryForList("secfiles.getUndownFiles", map);
}
通过DAO读取并操作Map结果集数据:
public void test_findUndownFiles() {
List<Map<String, Object>> co = ser.findUndownFiles(new HashMap());
StringBuilder s = new StringBuilder();
for (Map<String, Object> map : co) {
System.out.println("---------------------------");
for (Map.Entry<String, Object> entry : map.entrySet()) {
System.out.print(entry.getKey()+"\t");
System.out.println(entry.getValue());
}
}
}
打印结果:
---------------------------
sid 1
vfilename 200905252009235799
url http://d18.v.iask.com/f/1/f47817a394730dc682e660b943e84cc41006606.flv
status 0
filename 200905252009235799-00.flv
imgfile 200905252009234399.jpg
vid 1
imgurl http://p4.v.iask.com/95/595/1757503_1.jpg
---------------------------
sid 2130
vfilename 2009062615063867492
url http://lz.dhot.v.iask.com/f/1/0ee2ae8b973988f6a93c071c8045ca5217266409.mp4
status 0
filename 2009062615063867492-00.mp4
imgfile 2009062615063825434.jpg
vid 93
imgurl http://cache.mars.sina.com.cn/nd/movievideo//thumb/2/1502_120160.jpg
---------------------------
sid 2131
vfilename 2009062615064184076
url http://lz5.dhot.v.iask.com/f/1/36d3dadacb8d6bda434a58e7418ad3cc19037464.flv
status 0
filename 2009062615064184076-00.flv
imgfile 2009062615064136733.jpg
vid 94
imgurl http://cache.mars.sina.com.cn/nd/movievideo//thumb/6/2106_120160.jpg
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